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Wind turbine blade with a lightning protection system

a technology of lightning protection and wind turbine blade, which is applied in the direction of propellers, engine cooling devices, water-acting propulsive elements, etc., can solve the problems of insufficient influence of the layer on the electric field around damage to the insulation of the lightning down conductor and the wind turbine blade, etc., to provide the needed protection

Active Publication Date: 2014-11-18
LM GLASSFIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention describes a wind turbine blade that is protected from lightning strikes by using a conductive layer that is electrically isolated from the lightning down conductor and lightning receptor. This conductive layer acts as a parasitic conductor to lower the electric field around the lightning down conductor during a lightning strike, reducing the risk of flashovers and streamer / leader build-up. This new lightning protection system provides a much more efficient and effective protection against positive lightning strikes compared to conventional systems.

Problems solved by technology

If the sheet resistance of the conductive layer is too small, the conductive layer may act as a lightning receptor and increasing the risk of a flashover, potentially damaging the insulation of the lightning down conductor and the wind turbine blade.
On the other hand, if the sheet resistance is too large, the influence of the layer on the electric field around the lightning down conductor is insufficient to provide the needed protection.

Method used

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  • Wind turbine blade with a lightning protection system
  • Wind turbine blade with a lightning protection system
  • Wind turbine blade with a lightning protection system

Examples

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third embodiment

[0075]FIG. 3 shows a blade 101 according to the invention. The blade 101 according to this embodiment has a tip 105 formed as a solid body of e.g. polyurethane, PVC or fibre-reinforced polymer. The rest of the blade 101 is made of a shell body having a laminate shell 106. As in the embodiment shown in FIG. 1 and FIG. 2, the lightning protection system of the blade includes a lightning down conductor 102 extending substantially in the entire longitudinal direction of the blade 101 from the root end at the rotor hub and to the tip end as well as one or more conductive layers in or on the shell body (not shown) and extending along a part of the length of and in a transverse distance from the lightning down conductor 102. The lightning down conductor 102 is guided out of the cavity of the blade 101 and into a hole created in the tip 105 and matching the lightning down conductor 102. The lightning down conductor may be glued to this hole. The lightning down conductor is connected with a ...

fourth embodiment

[0078]FIG. 4 shows a blade 201 according to the invention. The blade 201 according to this embodiment has a tip 205 formed as a substantially solid body of e.g. polyurethane, PVC or fibre-reinforced polymer as in the embodiment shown in FIG. 3. The rest of the blade 201 is made of a shell body having a laminate shell 206. As in the embodiments shown in FIG. 1, FIG. 2, and FIG. 3, the lightning protection system of the blade 201 includes a lightning down conductor 202 extending substantially in the entire longitudinal direction of the blade 201 from the root end at the rotor hub and to the tip end as well as one or more conductive layers in or on the shell body (not shown) and extending along a part of the length of and in a transverse distance from the lightning down conductor 202. The lightning down conductor 202 is guided out of the cavity of the blade 201 and into a hole created in the tip 205 and fitting the shape of the lightning down conductor 202.

[0079]The lightning down cond...

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Abstract

The invention relates to a wind turbine blade with a lightning protection system, the lightning protection system comprises at least one lightning receptor arranged freely accessible in or on the shell unit surface at or in the immediate vicinity of the tip of the blade. The lightning protection system further comprises a lightning down conductor made of electrically conductive material extending within the shell body from the lightning receptor to the root end of the blade. The lightning receptor and the lightning down conductor are electrically connected. The shell body comprises at least a first conductive layer extending along at least a longitudinal part of the lightning down conductor in a transverse distance therefrom. The first conductive layer is electrically isolated from the lightning down conductor and from the lightning receptor, and has a sheet resistance in the range 1-5 Mega Ohm per square.

Description

[0001]This is a National Phase Application filed under 35 U.S.C. 371 as a national stage of PCT / EP2010 / 052904, filed 8 Mar. 2010, and claiming the benefit from European Application No. 09154511.1, filed Mar. 6, 2009, the content of which is hereby incorporated by reference in its entirety.TECHNICAL FIELD[0002]The present invention relates to a wind turbine blade with a lightning protection system, wherein the blade comprises a shell body made of a composite material and comprises a longitudinal direction with a root end and a tip end. The blade further comprises a profiled contour including a pressure side and a suction side, as well as a leading edge and a trailing edge with a chord having a chord length extending there between, the profiled contour, when being impacted by an incident airflow, generating a lift. The lightning protection system comprises at least one lightning receptor arranged freely accessible in or on a surface of the shell body. The lightning protection system f...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F03D1/06B23P15/02F03D11/00
CPCF05C2253/04Y10S415/908F03D1/0675Y02E10/721Y02E10/722F03D11/0033F05B2280/6003Y10T29/49337F03D80/30F05B2240/307Y02E10/72
Inventor HANSEN, LARS, BO
Owner LM GLASSFIBER
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